Wow! lots of great opinions here. . .
I have always changed my synthetic oil every 5K miles, and never had a problem. Always other parts of the car failed before the engine failed. I have never had a major engine failure since I started owning cars in 1980, with regular oil maintenance. With a low mileage use vehicle, a change every 6 months should keep the engine working well, as well as a brake check as high humidity / rain can cause rust on the rotors and increase brake wear and stopping distances. . .
A quick tip about checking oil using a dip stick:
pull the dipstick with a cold engine in the morning after sitting all night. The oil will have drained down into the pan, and the cool/cold nature of the oil will give an easier read on the dip stick as the oil is thicker and easier to see.
Regular maintenance on a large cost item will keep the large cost item from becoming future junk later rather than sooner, as all vehicles are future junk.
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